\Header{sum}{Sum of Vector Elements}
\keyword{arith}{sum}
\begin{Description}\relax
\code{sum} returns the sum of all the values
present in its arguments.
If \code{na.rm} is \code{FALSE} an \code{NA}
value in any of the arguments will cause
a value of \code{NA} to be returned, otherwise
\code{NA} values are ignored.\end{Description}
\begin{Usage}
\begin{verbatim}
sum(..., na.rm=FALSE)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{...}] numeric or complex vectors.
\item[\code{na.rm}] logical. Should missing values be removed?
\end{ldescription}
\end{Arguments}
\begin{Value}
The sum. If all of \code{...} are of type integer, then so is the
sum, and in that case the result will be \code{NA} (with a warning)
if integer overflow occurs.

NB: the sum of an empty set is zero, by definition.\end{Value}
\begin{References}\relax
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
\emph{The New S Language}.
Wadsworth \& Brooks/Cole.\end{References}

